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Edit File : streambuf_iterator.h \| Size : 13.44 KB
// Streambuf iterators // Copyright (C) 1997-2018 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /** @file bits/streambuf_iterator.h * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{iterator} / #ifndef _STREAMBUF_ITERATOR_H #define _STREAMBUF_ITERATOR_H 1 #pragma GCC system_header #include <streambuf> #include <debug/debug.h> namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION /* * @addtogroup iterators * @{ / // 24.5.3 Template class istreambuf_iterator /// Provides input iterator semantics for streambufs. template<typename _CharT, typename _Traits> class istreambuf_iterator : public iterator<input_iterator_tag, _CharT, typename _Traits::off_type, _CharT, #if __cplusplus >= 201103L // LWG 445. _CharT> #else _CharT&> #endif { public: // Types: //@{ /// Public typedefs typedef _CharT char_type; typedef _Traits traits_type; typedef typename _Traits::int_type int_type; typedef basic_streambuf<_CharT, _Traits> streambuf_type; typedef basic_istream<_CharT, _Traits> istream_type; //@} template<typename _CharT2> friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, ostreambuf_iterator<_CharT2> >::__type copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>, ostreambuf_iterator<_CharT2>); template<bool _IsMove, typename _CharT2> friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, _CharT2>::__type __copy_move_a2(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>, _CharT2); template<typename _CharT2> friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, istreambuf_iterator<_CharT2> >::__type find(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>, const _CharT2&); template<typename _CharT2, typename _Distance> friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, void>::__type advance(istreambuf_iterator<_CharT2>&, _Distance); private: // 24.5.3 istreambuf_iterator // p 1 // If the end of stream is reached (streambuf_type::sgetc() // returns traits_type::eof()), the iterator becomes equal to // the "end of stream" iterator value. // NB: This implementation assumes the "end of stream" value // is EOF, or -1. mutable streambuf_type* _M_sbuf; int_type _M_c; public: /// Construct end of input stream iterator. _GLIBCXX_CONSTEXPR istreambuf_iterator() _GLIBCXX_USE_NOEXCEPT : _M_sbuf(0), _M_c(traits_type::eof()) { } #if __cplusplus >= 201103L istreambuf_iterator(const istreambuf_iterator&) noexcept = default; ~istreambuf_iterator() = default; #endif /// Construct start of input stream iterator. istreambuf_iterator(istream_type& __s) _GLIBCXX_USE_NOEXCEPT : _M_sbuf(__s.rdbuf()), _M_c(traits_type::eof()) { } /// Construct start of streambuf iterator. istreambuf_iterator(streambuf_type* __s) _GLIBCXX_USE_NOEXCEPT : _M_sbuf(__s), _M_c(traits_type::eof()) { } /// Return the current character pointed to by iterator. This returns /// streambuf.sgetc(). It cannot be assigned. NB: The result of /// operator() on an end of stream is undefined. char_type operator() const { int_type __c = _M_get(); #ifdef _GLIBCXX_DEBUG_PEDANTIC // Dereferencing a past-the-end istreambuf_iterator is a // libstdc++ extension __glibcxx_requires_cond(!_S_is_eof(__c), _M_message(__gnu_debug::__msg_deref_istreambuf) ._M_iterator(this)); #endif return traits_type::to_char_type(__c); } /// Advance the iterator. Calls streambuf.sbumpc(). istreambuf_iterator& operator++() { __glibcxx_requires_cond(_M_sbuf && (!_S_is_eof(_M_c) \|\| !_S_is_eof(_M_sbuf->sgetc())), _M_message(__gnu_debug::__msg_inc_istreambuf) ._M_iterator(this)); _M_sbuf->sbumpc(); _M_c = traits_type::eof(); return this; } /// Advance the iterator. Calls streambuf.sbumpc(). istreambuf_iterator operator++(int) { __glibcxx_requires_cond(_M_sbuf && (!_S_is_eof(_M_c) \|\| !_S_is_eof(_M_sbuf->sgetc())), _M_message(__gnu_debug::__msg_inc_istreambuf) ._M_iterator(this)); istreambuf_iterator __old = this; __old._M_c = _M_sbuf->sbumpc(); _M_c = traits_type::eof(); return __old; } // _GLIBCXX_RESOLVE_LIB_DEFECTS // 110 istreambuf_iterator::equal not const // NB: there is also number 111 (NAD) relevant to this function. /// Return true both iterators are end or both are not end. bool equal(const istreambuf_iterator& __b) const { return _M_at_eof() == __b._M_at_eof(); } private: int_type _M_get() const { int_type __ret = _M_c; if (_M_sbuf && _S_is_eof(__ret) && _S_is_eof(__ret = _M_sbuf->sgetc())) _M_sbuf = 0; return __ret; } bool _M_at_eof() const { return _S_is_eof(_M_get()); } static bool _S_is_eof(int_type __c) { const int_type __eof = traits_type::eof(); return traits_type::eq_int_type(__c, __eof); } }; template<typename _CharT, typename _Traits> inline bool operator==(const istreambuf_iterator<_CharT, _Traits>& __a, const istreambuf_iterator<_CharT, _Traits>& __b) { return __a.equal(__b); } template<typename _CharT, typename _Traits> inline bool operator!=(const istreambuf_iterator<_CharT, _Traits>& __a, const istreambuf_iterator<_CharT, _Traits>& __b) { return !__a.equal(__b); } /// Provides output iterator semantics for streambufs. template<typename _CharT, typename _Traits> class ostreambuf_iterator : public iterator<output_iterator_tag, void, void, void, void> { public: // Types: //@{ /// Public typedefs typedef _CharT char_type; typedef _Traits traits_type; typedef basic_streambuf<_CharT, _Traits> streambuf_type; typedef basic_ostream<_CharT, _Traits> ostream_type; //@} template<typename _CharT2> friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, ostreambuf_iterator<_CharT2> >::__type copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>, ostreambuf_iterator<_CharT2>); private: streambuf_type _M_sbuf; bool _M_failed; public: /// Construct output iterator from ostream. ostreambuf_iterator(ostream_type& __s) _GLIBCXX_USE_NOEXCEPT : _M_sbuf(__s.rdbuf()), _M_failed(!_M_sbuf) { } /// Construct output iterator from streambuf. ostreambuf_iterator(streambuf_type* __s) _GLIBCXX_USE_NOEXCEPT : _M_sbuf(__s), _M_failed(!_M_sbuf) { } /// Write character to streambuf. Calls streambuf.sputc(). ostreambuf_iterator& operator=(_CharT __c) { if (!_M_failed && _Traits::eq_int_type(_M_sbuf->sputc(__c), _Traits::eof())) _M_failed = true; return this; } /// Return this. ostreambuf_iterator& operator() { return this; } /// Return this. ostreambuf_iterator& operator++(int) { return this; } /// Return this. ostreambuf_iterator& operator++() { return this; } /// Return true if previous operator=() failed. bool failed() const _GLIBCXX_USE_NOEXCEPT { return _M_failed; } ostreambuf_iterator& _M_put(const _CharT* __ws, streamsize __len) { if (__builtin_expect(!_M_failed, true) && __builtin_expect(this->_M_sbuf->sputn(__ws, __len) != __len, false)) _M_failed = true; return this; } }; // Overloads for streambuf iterators. template<typename _CharT> typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, ostreambuf_iterator<_CharT> >::__type copy(istreambuf_iterator<_CharT> __first, istreambuf_iterator<_CharT> __last, ostreambuf_iterator<_CharT> __result) { if (__first._M_sbuf && !__last._M_sbuf && !__result._M_failed) { bool __ineof; __copy_streambufs_eof(__first._M_sbuf, __result._M_sbuf, __ineof); if (!__ineof) __result._M_failed = true; } return __result; } template<bool _IsMove, typename _CharT> typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, ostreambuf_iterator<_CharT> >::__type __copy_move_a2(_CharT __first, _CharT* __last, ostreambuf_iterator<_CharT> __result) { const streamsize __num = __last - __first; if (__num > 0) __result._M_put(__first, __num); return __result; } template<bool _IsMove, typename _CharT> typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, ostreambuf_iterator<_CharT> >::__type __copy_move_a2(const _CharT* __first, const _CharT* __last, ostreambuf_iterator<_CharT> __result) { const streamsize __num = __last - __first; if (__num > 0) __result._M_put(__first, __num); return __result; } template<bool _IsMove, typename _CharT> typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, _CharT>::__type __copy_move_a2(istreambuf_iterator<_CharT> __first, istreambuf_iterator<_CharT> __last, _CharT __result) { typedef istreambuf_iterator<_CharT> __is_iterator_type; typedef typename __is_iterator_type::traits_type traits_type; typedef typename __is_iterator_type::streambuf_type streambuf_type; typedef typename traits_type::int_type int_type; if (__first._M_sbuf && !__last._M_sbuf) { streambuf_type* __sb = __first._M_sbuf; int_type __c = __sb->sgetc(); while (!traits_type::eq_int_type(__c, traits_type::eof())) { const streamsize __n = __sb->egptr() - __sb->gptr(); if (__n > 1) { traits_type::copy(__result, __sb->gptr(), __n); __sb->__safe_gbump(__n); __result += __n; __c = __sb->underflow(); } else { __result++ = traits_type::to_char_type(__c); __c = __sb->snextc(); } } } return __result; } template<typename _CharT> typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, istreambuf_iterator<_CharT> >::__type find(istreambuf_iterator<_CharT> __first, istreambuf_iterator<_CharT> __last, const _CharT& __val) { typedef istreambuf_iterator<_CharT> __is_iterator_type; typedef typename __is_iterator_type::traits_type traits_type; typedef typename __is_iterator_type::streambuf_type streambuf_type; typedef typename traits_type::int_type int_type; const int_type __eof = traits_type::eof(); if (__first._M_sbuf && !__last._M_sbuf) { const int_type __ival = traits_type::to_int_type(__val); streambuf_type __sb = __first._M_sbuf; int_type __c = __sb->sgetc(); while (!traits_type::eq_int_type(__c, __eof) && !traits_type::eq_int_type(__c, __ival)) { streamsize __n = __sb->egptr() - __sb->gptr(); if (__n > 1) { const _CharT* __p = traits_type::find(__sb->gptr(), __n, __val); if (__p) __n = __p - __sb->gptr(); __sb->__safe_gbump(__n); __c = __sb->sgetc(); } else __c = __sb->snextc(); } __first._M_c = __eof; } return __first; } template<typename _CharT, typename _Distance> typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, void>::__type advance(istreambuf_iterator<_CharT>& __i, _Distance __n) { if (__n == 0) return; __glibcxx_assert(__n > 0); __glibcxx_requires_cond(!__i._M_at_eof(), _M_message(__gnu_debug::__msg_inc_istreambuf) ._M_iterator(__i)); typedef istreambuf_iterator<_CharT> __is_iterator_type; typedef typename __is_iterator_type::traits_type traits_type; typedef typename __is_iterator_type::streambuf_type streambuf_type; typedef typename traits_type::int_type int_type; const int_type __eof = traits_type::eof(); streambuf_type* __sb = __i._M_sbuf; while (__n > 0) { streamsize __size = __sb->egptr() - __sb->gptr(); if (__size > __n) { __sb->__safe_gbump(__n); break; } __sb->__safe_gbump(__size); __n -= __size; if (traits_type::eq_int_type(__sb->underflow(), __eof)) { __glibcxx_requires_cond(__n == 0, _M_message(__gnu_debug::__msg_inc_istreambuf) ._M_iterator(__i)); break; } } __i._M_c = __eof; } // @} group iterators _GLIBCXX_END_NAMESPACE_VERSION } // namespace #endif Back

Edit File : streambuf_iterator.h | Size : 13.44 KB

// Streambuf iterators

// Copyright (C) 1997-2018 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

/** @file bits/streambuf_iterator.h
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{iterator}
 */

#ifndef _STREAMBUF_ITERATOR_H
#define _STREAMBUF_ITERATOR_H 1

#pragma GCC system_header

#include <streambuf>
#include <debug/debug.h>

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

/**
   * @addtogroup iterators
   * @{
   */

// 24.5.3 Template class istreambuf_iterator
  /// Provides input iterator semantics for streambufs.
  template<typename _CharT, typename _Traits>
    class istreambuf_iterator
    : public iterator<input_iterator_tag, _CharT, typename _Traits::off_type,
		      _CharT*,
#if __cplusplus >= 201103L
    // LWG 445.
		      _CharT>
#else
		      _CharT&>
#endif
    {
    public:
      // Types:
      //@{
      /// Public typedefs
      typedef _CharT					char_type;
      typedef _Traits					traits_type;
      typedef typename _Traits::int_type		int_type;
      typedef basic_streambuf<_CharT, _Traits>		streambuf_type;
      typedef basic_istream<_CharT, _Traits>		istream_type;
      //@}

template<typename _CharT2>
	friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
				    ostreambuf_iterator<_CharT2> >::__type
	copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
	     ostreambuf_iterator<_CharT2>);

template<bool _IsMove, typename _CharT2>
	friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
					       _CharT2*>::__type
	__copy_move_a2(istreambuf_iterator<_CharT2>,
		       istreambuf_iterator<_CharT2>, _CharT2*);

template<typename _CharT2>
	friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
				    istreambuf_iterator<_CharT2> >::__type
	find(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
	     const _CharT2&);

template<typename _CharT2, typename _Distance>
	friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
					       void>::__type
	advance(istreambuf_iterator<_CharT2>&, _Distance);

private:
      // 24.5.3 istreambuf_iterator
      // p 1
      // If the end of stream is reached (streambuf_type::sgetc()
      // returns traits_type::eof()), the iterator becomes equal to
      // the "end of stream" iterator value.
      // NB: This implementation assumes the "end of stream" value
      // is EOF, or -1.
      mutable streambuf_type*	_M_sbuf;
      int_type			_M_c;

public:
      ///  Construct end of input stream iterator.
      _GLIBCXX_CONSTEXPR istreambuf_iterator() _GLIBCXX_USE_NOEXCEPT
      : _M_sbuf(0), _M_c(traits_type::eof()) { }

#if __cplusplus >= 201103L
      istreambuf_iterator(const istreambuf_iterator&) noexcept = default;

~istreambuf_iterator() = default;
#endif

///  Construct start of input stream iterator.
      istreambuf_iterator(istream_type& __s) _GLIBCXX_USE_NOEXCEPT
      : _M_sbuf(__s.rdbuf()), _M_c(traits_type::eof()) { }

///  Construct start of streambuf iterator.
      istreambuf_iterator(streambuf_type* __s) _GLIBCXX_USE_NOEXCEPT
      : _M_sbuf(__s), _M_c(traits_type::eof()) { }

///  Return the current character pointed to by iterator.  This returns
      ///  streambuf.sgetc().  It cannot be assigned.  NB: The result of
      ///  operator*() on an end of stream is undefined.
      char_type
      operator*() const
      {
	int_type __c = _M_get();

#ifdef _GLIBCXX_DEBUG_PEDANTIC
	// Dereferencing a past-the-end istreambuf_iterator is a
	// libstdc++ extension
	__glibcxx_requires_cond(!_S_is_eof(__c),
				_M_message(__gnu_debug::__msg_deref_istreambuf)
				._M_iterator(*this));
#endif
	return traits_type::to_char_type(__c);
      }

/// Advance the iterator.  Calls streambuf.sbumpc().
      istreambuf_iterator&
      operator++()
      {
	__glibcxx_requires_cond(_M_sbuf &&
				(!_S_is_eof(_M_c) || !_S_is_eof(_M_sbuf->sgetc())),
				_M_message(__gnu_debug::__msg_inc_istreambuf)
				._M_iterator(*this));

_M_sbuf->sbumpc();
	_M_c = traits_type::eof();
	return *this;
      }

/// Advance the iterator.  Calls streambuf.sbumpc().
      istreambuf_iterator
      operator++(int)
      {
	__glibcxx_requires_cond(_M_sbuf &&
				(!_S_is_eof(_M_c) || !_S_is_eof(_M_sbuf->sgetc())),
				_M_message(__gnu_debug::__msg_inc_istreambuf)
				._M_iterator(*this));

istreambuf_iterator __old = *this;
	__old._M_c = _M_sbuf->sbumpc();
	_M_c = traits_type::eof();
	return __old;
      }

// _GLIBCXX_RESOLVE_LIB_DEFECTS
      // 110 istreambuf_iterator::equal not const
      // NB: there is also number 111 (NAD) relevant to this function.
      /// Return true both iterators are end or both are not end.
      bool
      equal(const istreambuf_iterator& __b) const
      { return _M_at_eof() == __b._M_at_eof(); }

private:
      int_type
      _M_get() const
      {
	int_type __ret = _M_c;
	if (_M_sbuf && _S_is_eof(__ret) && _S_is_eof(__ret = _M_sbuf->sgetc()))
	  _M_sbuf = 0;
	return __ret;
      }

bool
      _M_at_eof() const
      { return _S_is_eof(_M_get()); }

static bool
      _S_is_eof(int_type __c)
      {
	const int_type __eof = traits_type::eof();
	return traits_type::eq_int_type(__c, __eof);
      }
    };

template<typename _CharT, typename _Traits>
    inline bool
    operator==(const istreambuf_iterator<_CharT, _Traits>& __a,
	       const istreambuf_iterator<_CharT, _Traits>& __b)
    { return __a.equal(__b); }

template<typename _CharT, typename _Traits>
    inline bool
    operator!=(const istreambuf_iterator<_CharT, _Traits>& __a,
	       const istreambuf_iterator<_CharT, _Traits>& __b)
    { return !__a.equal(__b); }

/// Provides output iterator semantics for streambufs.
  template<typename _CharT, typename _Traits>
    class ostreambuf_iterator
    : public iterator<output_iterator_tag, void, void, void, void>
    {
    public:
      // Types:
      //@{
      /// Public typedefs
      typedef _CharT			       char_type;
      typedef _Traits			       traits_type;
      typedef basic_streambuf<_CharT, _Traits> streambuf_type;
      typedef basic_ostream<_CharT, _Traits>   ostream_type;
      //@}

private:
      streambuf_type*	_M_sbuf;
      bool		_M_failed;

public:
      ///  Construct output iterator from ostream.
      ostreambuf_iterator(ostream_type& __s) _GLIBCXX_USE_NOEXCEPT
      : _M_sbuf(__s.rdbuf()), _M_failed(!_M_sbuf) { }

///  Construct output iterator from streambuf.
      ostreambuf_iterator(streambuf_type* __s) _GLIBCXX_USE_NOEXCEPT
      : _M_sbuf(__s), _M_failed(!_M_sbuf) { }

///  Write character to streambuf.  Calls streambuf.sputc().
      ostreambuf_iterator&
      operator=(_CharT __c)
      {
	if (!_M_failed &&
	    _Traits::eq_int_type(_M_sbuf->sputc(__c), _Traits::eof()))
	  _M_failed = true;
	return *this;
      }

/// Return *this.
      ostreambuf_iterator&
      operator*()
      { return *this; }

/// Return *this.
      ostreambuf_iterator&
      operator++(int)
      { return *this; }

/// Return *this.
      ostreambuf_iterator&
      operator++()
      { return *this; }

/// Return true if previous operator=() failed.
      bool
      failed() const _GLIBCXX_USE_NOEXCEPT
      { return _M_failed; }

ostreambuf_iterator&
      _M_put(const _CharT* __ws, streamsize __len)
      {
	if (__builtin_expect(!_M_failed, true)
	    && __builtin_expect(this->_M_sbuf->sputn(__ws, __len) != __len,
				false))
	  _M_failed = true;
	return *this;
      }
    };

// Overloads for streambuf iterators.
  template<typename _CharT>
    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
				    ostreambuf_iterator<_CharT> >::__type
    copy(istreambuf_iterator<_CharT> __first,
	 istreambuf_iterator<_CharT> __last,
	 ostreambuf_iterator<_CharT> __result)
    {
      if (__first._M_sbuf && !__last._M_sbuf && !__result._M_failed)
	{
	  bool __ineof;
	  __copy_streambufs_eof(__first._M_sbuf, __result._M_sbuf, __ineof);
	  if (!__ineof)
	    __result._M_failed = true;
	}
      return __result;
    }

template<bool _IsMove, typename _CharT>
    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
				    ostreambuf_iterator<_CharT> >::__type
    __copy_move_a2(_CharT* __first, _CharT* __last,
		   ostreambuf_iterator<_CharT> __result)
    {
      const streamsize __num = __last - __first;
      if (__num > 0)
	__result._M_put(__first, __num);
      return __result;
    }

template<bool _IsMove, typename _CharT>
    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
				    ostreambuf_iterator<_CharT> >::__type
    __copy_move_a2(const _CharT* __first, const _CharT* __last,
		   ostreambuf_iterator<_CharT> __result)
    {
      const streamsize __num = __last - __first;
      if (__num > 0)
	__result._M_put(__first, __num);
      return __result;
    }

template<bool _IsMove, typename _CharT>
    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
				    _CharT*>::__type
    __copy_move_a2(istreambuf_iterator<_CharT> __first,
		   istreambuf_iterator<_CharT> __last, _CharT* __result)
    {
      typedef istreambuf_iterator<_CharT>		   __is_iterator_type;
      typedef typename __is_iterator_type::traits_type	   traits_type;
      typedef typename __is_iterator_type::streambuf_type  streambuf_type;
      typedef typename traits_type::int_type		   int_type;

if (__first._M_sbuf && !__last._M_sbuf)
	{
	  streambuf_type* __sb = __first._M_sbuf;
	  int_type __c = __sb->sgetc();
	  while (!traits_type::eq_int_type(__c, traits_type::eof()))
	    {
	      const streamsize __n = __sb->egptr() - __sb->gptr();
	      if (__n > 1)
		{
		  traits_type::copy(__result, __sb->gptr(), __n);
		  __sb->__safe_gbump(__n);
		  __result += __n;
		  __c = __sb->underflow();
		}
	      else
		{
		  *__result++ = traits_type::to_char_type(__c);
		  __c = __sb->snextc();
		}
	    }
	}
      return __result;
    }

template<typename _CharT>
    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
		  		    istreambuf_iterator<_CharT> >::__type
    find(istreambuf_iterator<_CharT> __first,
	 istreambuf_iterator<_CharT> __last, const _CharT& __val)
    {
      typedef istreambuf_iterator<_CharT>		   __is_iterator_type;
      typedef typename __is_iterator_type::traits_type     traits_type;
      typedef typename __is_iterator_type::streambuf_type  streambuf_type;
      typedef typename traits_type::int_type		   int_type;
      const int_type __eof = traits_type::eof();

if (__first._M_sbuf && !__last._M_sbuf)
	{
	  const int_type __ival = traits_type::to_int_type(__val);
	  streambuf_type* __sb = __first._M_sbuf;
	  int_type __c = __sb->sgetc();
	  while (!traits_type::eq_int_type(__c, __eof)
		 && !traits_type::eq_int_type(__c, __ival))
	    {
	      streamsize __n = __sb->egptr() - __sb->gptr();
	      if (__n > 1)
		{
		  const _CharT* __p = traits_type::find(__sb->gptr(),
							__n, __val);
		  if (__p)
		    __n = __p - __sb->gptr();
		  __sb->__safe_gbump(__n);
		  __c = __sb->sgetc();
		}
	      else
		__c = __sb->snextc();
	    }

__first._M_c = __eof;
	}

return __first;
    }

template<typename _CharT, typename _Distance>
    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
				    void>::__type
    advance(istreambuf_iterator<_CharT>& __i, _Distance __n)
    {
      if (__n == 0)
	return;

__glibcxx_assert(__n > 0);
      __glibcxx_requires_cond(!__i._M_at_eof(),
			      _M_message(__gnu_debug::__msg_inc_istreambuf)
			      ._M_iterator(__i));

typedef istreambuf_iterator<_CharT>		   __is_iterator_type;
      typedef typename __is_iterator_type::traits_type	   traits_type;
      typedef typename __is_iterator_type::streambuf_type  streambuf_type;
      typedef typename traits_type::int_type		   int_type;
      const int_type __eof = traits_type::eof();

streambuf_type* __sb = __i._M_sbuf;
      while (__n > 0)
	{
	  streamsize __size = __sb->egptr() - __sb->gptr();
	  if (__size > __n)
	    {
	      __sb->__safe_gbump(__n);
	      break;
	    }

__sb->__safe_gbump(__size);
	  __n -= __size;
	  if (traits_type::eq_int_type(__sb->underflow(), __eof))
	    {
	      __glibcxx_requires_cond(__n == 0,
				_M_message(__gnu_debug::__msg_inc_istreambuf)
				._M_iterator(__i));
	      break;
	    }
	}

__i._M_c = __eof;
    }

// @} group iterators

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace

#endif

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